Variation in Speech Intelligibility Ratings as a Function of Speech Rate Modification in Parkinson's Disease

Purpose: The aim of this study was to quantify changes in speech intelligibility in two cohorts of people with Parkinson's disease (PD; those with and without deep brain stimulation [DBS]) across a broad range of self-selected speech rate alterations in: (1) read sentences; and (2) extemporaneo...

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Bibliographic Details
Published in:Journal of speech, language, and hearing research language, and hearing research, 2021-06, Vol.64 (6), p.1773-1793
Main Authors: Knowles, Thea, Adams, Scott G, Jog, Mandar
Format: Article
Language:English
Subjects:
Age Differences
Analysis
Audio Equipment
Brain Hemisphere Functions
Care and treatment
Comparative Analysis
Correlation
Deep brain stimulation
Diagnosis
Diseases
Drug Therapy
Dysarthria
Evaluators
Intelligibility
Oral Reading
Outcomes of Treatment
Parkinson's disease
Patient outcomes
Sentences
Speaking
Speech
Speech Communication
Speech Impairments
Speech Improvement
Speech rate
Speech therapy
Speech, Intelligibility of
Task Analysis
Therapy
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Summary:Purpose: The aim of this study was to quantify changes in speech intelligibility in two cohorts of people with Parkinson's disease (PD; those with and without deep brain stimulation [DBS]) across a broad range of self-selected speech rate alterations in: (1) read sentences; and (2) extemporaneous speech (monologues). Method: Four speaker groups participated in this study: younger and older controls, people with PD undergoing standard pharmaceutical treatment, and people with PD and DBS. Naïve listeners rated the intelligibility of read sentences and extemporaneous monologues, spoken by participants at seven self-selected speech rates from very slow to very fast. Intelligibility was modeled as a function of group, speech rate condition, and speech task. Results: Overall, compared to habitual speech rate, slower speech rate conditions were not associated with changes in speech intelligibility, whereas faster-than-habitual conditions were associated in declines in intelligibility. Results were mediated by group and task effects, such that talkers with PD and DBS were more likely to see intelligibility benefits at slower self-selected speech rates and less likely to see detriments at faster rates, and these differences were amplified in monologues compared to sentences. Conclusion: Findings suggest differences in the ways in which slower and faster speech rate adjustments impact speech intelligibility in people with PD with and without DBS, with the latter demonstrating greater magnitudes of change.
ISSN:1092-4388
1558-9102
DOI:10.1044/2021_JSLHR-20-00593